[GRASSLIST:593] Re: set up grass location

[Nagesh Bhatkar]

Hi,
I just thought of sharing this with you.

In the ~/grass-6.0.1/lib/init directory(prior to compilation of GRASS), 
the programs mke_loc.c , set_data.c  can be edited  to create location 
and mapset, automatically everytime u start a GRASS session  for the 
first  time and to avoid inputting the values at the command prompt
to set the geographic region. One can set the all the values internally. 
Also the PROJ_INFO and PROJ_UNITS files can be
created within the programs. Later using g.setproj the proj info could 
be changed.
I did the above procedure because i wanted GRASS to start with the 
geographic region being set since we all use the same coordinate
system(lat/lon) and ellipsoid WGS84.



 
Nagesh



Maciek Sieczka wrote:

>On Tue, 4 Apr 2006 11:32:31 +0100
>"Ana Soares" <tiobrothercamarada at gmail.com> wrote:
>
>  
>
>>Hello :)
>>
>>Is there any way to set up a new grass location (with all those
>>fields : coordinate system, etc) without using the terminal ?
>>    
>>
>
>For 6.x, using EPSG codes if Grass is started GUI mode.
>
>Another option is to setup a quick'n'dirty XY location and use g.proj
>to modify the projection, eg. by PROJ.4 syntax or a file with WKT
>projection definition (RTM for details).
>
>  
>
>>I mean, is there (and if there is, what is it) any structure where
>>grass keeps this info so that I can enter it ? I know it uses
>>environment variables, but I don't know
>>what to do for the fields like coordinate system, datum, etc
>>    
>>
>
>Grass depends on PROJ.4 for projections handling.
>
>Read cs2cs man to learn how to get the names it uses.
>
>Check epsg and esri files in the directory where your PROJ.4 is
>installed for some complete cordinate systems strings.
>
>Proj.4 naming is 90% compatible with Grass, but:
>
>PROJ.4			Grass
>latlong			ll
>krass			krassovsky
>
>
>Propably more like these, but only these I know.
>
>
>Also, PROJ.4 needs uppercase ellipsoids names, while Grass tolerates
>both lower and uppercase.
>
>Then check projections, ellipse.table and datum.table in the
>dir where_your_grass_lives/etc/. Seems they are not complete, but will
>give you some further insight.
>
>It's all a bit mess but that's the way it is for now, due to legacy
>reasons.
>
>Maciek
>
>--------------------
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>
>
>
>  
>